When Hamid Karzai issued his angry ultimatum to the United States over an airstrike that killed women and children in Helmand province on May 28, he left a crucial piece of the story out: The shooting death, also on May 28, of an anonymous U.S. Marine, which triggered the fighting that led to the airstrike. I think I’ve found out who the Marine was. The American killed in Helmand province on May 28 was Lance Cpl. Peter Clore. He was 23 years old. Only six weeks in Afghanistan, Clore and his war dog Duke were leading a patrol to clear improvised explosive devices.